The age of the Sun is about
A. 5.5 million years.
B. 5.5 trillion years.
C. 5.5 billion years.
D. 7000 years.
E. more than 5.5 trillion years.
Answer: C
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Although rocks are affected by interactions among all six major subsystems of Earth, rocks are physically classified in the ____ subsystem.
a. atmosphere b. hydrosphere c. biosphere d. lithosphere e. inner core
Based upon the history of the U.S. federal government's involvement in controlling water pollution, which one of the following scenarios would have most likely occurred?
A) In 1908, federal inspectors reported unacceptably high levels of petroleum products in a river. B) In 1898, a city receives a federal grant for one million dollars to improve its handling of industrial wastes draining into a nearby river. C) In 1947, agents of the federal Environmental Protection Agency fined a company for dumping industrial waste into a local stream. D) In 1952, federal agents advised a city on the best way to handle its sewage and storm water.
The environmental effects of damming rivers for hydropower are minimal
Indicate whether the statement is true or false
Given that a region has an average annual air temperature of 13°C, what would the subsurface temperature be at a depth of 2 km? Assume the geothermal gradient is the same as the world average geothermal gradient, which is approximately 30°C per kilometer.
A. 80°C B. 93°C C. 60°C D. 73°C